A single water circuit ground source heat pump system

Abstract

The utility model relates to a kind of single waterway circulation's ground source heat pump system, the system includes compressor, ground source side heat exchanger, throttling valve and user side heat exchanger connected in turn by refrigerant circulation pipeline, and single waterway for connecting external ground source water source water taking system, ground source side heat exchanger, user side heat exchanger and external user side water using system in turn, further include branch waterway, the water inlet of the branch waterway is connected with the single waterway between ground source side heat exchanger and user side heat exchanger, the water outlet of the branch waterway is connected with the single waterway between user side heat exchanger and external user side water using system, first flow regulating valve is arranged in the single waterway of the water inlet of the branch waterway to the water inlet of user side heat exchanger, and a circulating water pump is arranged in the single waterway between ground source side heat exchanger and external ground source water source water taking system.The system makes the temperature difference of user side outlet water and user side inlet water adjustable and keep in set range, avoid the emergence of the problem that compressor exceeds operation block diagram, unit operation anomaly.

Description

Technical Field

[0001] This utility model relates to the technical field of ground source heat pump systems, and in particular to a ground source heat pump system with a single water circulation loop. Background Technology

[0002] Ground source heat pump systems utilize shallow geothermal resources, such as soil, groundwater, or surface water, as low-temperature heat sources. By inputting a small amount of high-grade energy, such as electricity, they transfer energy from the low-temperature heat source to the high-temperature heat source. In winter, the system absorbs heat from shallow geothermal resources and releases it to the user side for heating. In summer, it absorbs heat from the user side and releases it back into the ground, providing cooling. It is widely used in commercial and residential buildings, industrial plants, and agricultural and livestock sheds for heating and cooling.

[0003] Please see Figure 1 Existing ground source heat pump systems typically employ a dual-circuit water system, including a ground-side water circulation system and a user-side water circulation system. Each circulation system has a pump to drive the water medium to circulate in the heat exchange pipeline, as well as water pipelines connecting the water source intake and return, and the user-side water return. The dual-circuit system with multiple pumps and pipelines generates low-to-medium frequency noise due to pump operation and pipeline vibration. This noise propagates into various application scenarios, including commercial and residential buildings, industrial plants, and agricultural and livestock sheds.

[0004] However, such noise is unacceptable for applications with special requirements, such as recording studios and concert halls in buildings, optical and acoustic laboratories in research institutions, and operating rooms in hospitals, where there are high requirements for noise levels.

[0005] To address this, some suppliers have proposed connecting the ground source side outlet water to the user side inlet water to achieve a single water loop circulation, thereby reducing the number of water pumps in the water loop circulation and reducing the noise problem of the dual water loop circulation of the ground source heat pump system by reducing noise sources. However, this single water loop connection method makes it impossible to control the temperature difference between the ground source side and the user side and fail to meet the requirements, which will cause the compressor to exceed the operating block diagram and the unit to operate abnormally. Utility Model Content

[0006] Based on this, the purpose of this utility model is to provide a ground source heat pump system with a single water circulation, which can reduce the noise and cost of the ground source heat pump system while achieving the regulation of the cooling and heating temperature on the user side and the stable operation of the compressor.

[0007] A ground source heat pump system with a single-circuit water system includes a compressor, a ground source heat exchanger, a throttling valve, and a user-side heat exchanger connected sequentially via a refrigerant circulation pipeline. It also includes a single water circuit that sequentially connects an external ground source water intake system, the ground source heat exchanger, the user-side heat exchanger, and an external user-side water system. The system further includes branch water circuits. The inlet of each branch water circuit is connected via a water pipe to a single water circuit between the ground source heat exchanger and the user-side heat exchanger. The outlet of each branch water circuit is connected via a water pipe to a single water circuit between the user-side heat exchanger and the external user-side water system. A first flow regulating valve is installed in the single water circuit from the inlet of the branch water circuit to the inlet of the user-side heat exchanger. A circulating water pump is installed in the single water circuit between the ground source heat exchanger and the external ground source water intake system.

[0008] Compared with the prior art, this utility model sets a three-way pipe at the outlet of the ground source heat exchanger in the single water circuit of the ground source heat pump system, and then connects it to the inlet and outlet of the user-side heat exchanger respectively. A first flow regulating valve is set in the water pipeline from the three-way pipe to the inlet of the user-side heat exchanger, so that the temperature difference between the user-side outlet water and the user-side inlet water can be adjusted and kept within a set range, avoiding the compressor exceeding the operating block diagram and the unit operating abnormally.

[0009] Furthermore, a first flow meter is installed in the single water path between the first flow regulating valve and the inlet of the user-side heat exchanger.

[0010] Furthermore, a second flow regulating valve is installed in the branch waterway.

[0011] Furthermore, the first flow regulating valve and the second flow regulating valve are shut-off valves or one-way regulating valves.

[0012] Furthermore, a second flow meter is installed in the single water passage between the outlet of the ground source heat exchanger and the inlet of the branch water passage.

[0013] Furthermore, the first flow meter and the second flow meter are propeller-type flow meters, electromagnetic flow meters, ultrasonic flow meters, or electromagnetic flow meters. A first temperature sensor is provided at the inlet of the user-side heat exchanger.

[0014] Furthermore, a first temperature sensor is installed at the inlet of the user-side heat exchanger to detect the temperature of the incoming water on the user side. A second temperature sensor is installed at the outlet of the user-side heat exchanger to detect the temperature of the water outlet on the user side.

[0015] Furthermore, the single-circuit ground source heat pump system also includes a controller, which is electrically and / or communicatively connected to a first temperature sensor, a second temperature sensor, a first flow meter, a second flow meter, a first flow regulating valve, and a second flow regulating valve.

[0016] Furthermore, the controller according to and The temperature difference and the current flow rates of the first and second flow meters are used to control the opening of the first flow regulating valve and / or the second flow regulating valve.

[0017] Furthermore, a one-way valve is installed in the single water passage between the outlet of the user-side heat exchanger and the outlet of the branch water passage.

[0018] To better understand and implement this invention, the following detailed description is provided in conjunction with the accompanying drawings. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of a ground source heat pump system with dual water circulation in the prior art;

[0020] Figure 2 This is a schematic diagram of the ground source heat pump system with a single water circulation path according to this utility model;

[0021] In the diagram: 10-Compressor; 20-Ground source heat exchanger; 21-Ground source inlet; 22-Ground source outlet; 30-Throttle valve; 40-User-side heat exchanger; 41-User-side inlet; 42-User-side outlet; 51-First connecting water pipe; 511-Circulating water pump; 52-Second connecting water pipe; 521-Check valve; 53-Third connecting water pipe; 531-First flow regulating valve; 532-First flow meter; 533-Second flow regulating valve; 534-Second flow meter; 54-Branch water pipe; 541-First tee pipe; 542-Second tee pipe; 61-First temperature sensor; 62-Second temperature sensor. Detailed Implementation

[0022] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings of the embodiments thereof.

[0023] To address the noise issue in existing ground source heat pump systems that use a single-loop circulation system to directly connect the ground source side outlet water to the user side inlet water, thus reducing noise compared to dual-loop systems, the system struggles to effectively control the user side outlet water temperature. When the temperature difference between the user side inlet and outlet water is too small, the heat exchanger cannot achieve effective heat exchange, leading to an increase in the refrigerant's condensation temperature. This forces the refrigerant to operate at higher pressures, resulting in increased system pressure. As the system pressure increases, the compressor's pressure ratio (the ratio of compressor outlet pressure to inlet pressure) also increases, requiring the compressor to withstand a greater workload. This leads to increased compressor energy consumption, reduced efficiency, and potentially causes the compressor to exceed its operating parameters and malfunction.

[0024] Based on this, the present invention proposes a single-loop ground source heat pump system. This single-loop ground source heat pump system establishes a water pipeline between the user-side inlet and outlet water in the single water loop, and installs a first flow regulating valve in this pipeline to regulate the water flow from the ground source side outlet to the user-side outlet water. This controls the temperature difference between the user-side inlet and outlet water to remain within a set range, preventing the compressor from exceeding its operating parameters and causing unit malfunctions.

[0025] Please see Figure 2 The ground source heat pump system with single-circuit water circulation according to this utility model includes a compressor 10, a ground source heat exchanger 20, a throttle valve 30 and a user-side heat exchanger 40 connected in sequence through a refrigerant circulation pipeline; and a single water circuit that connects an external ground source water intake system (not shown), a ground source heat exchanger 20, a user-side heat exchanger 40 and an external user-side water system (not shown) in sequence.

[0026] The ground source heat exchanger 20 includes a ground source inlet 21 and a ground source outlet 22.

[0027] The user-side heat exchanger 40 includes a user-side inlet 41 and a user-side outlet 42.

[0028] The single waterway includes a first connecting water pipe 51, a second connecting water pipe 52, a third connecting water pipe 53, and a branch waterway 54.

[0029] The first connecting water pipe 51 is used to connect the external ground source water intake system to the ground source side water inlet 21, and includes a circulating water pump 511.

[0030] The second water connection pipe 52 is used to connect the user-side water outlet 42 to the external user-side water system. Furthermore, a one-way valve 521 is also provided in the second water connection pipe 52 near the user-side water outlet 42.

[0031] The third connecting water pipe 53 is used to connect the ground source side water outlet 22 to the user side water inlet 41.

[0032] Branch waterway 54 is used to connect the third connecting waterway 53 and the second connecting waterway 52. ​​The inlet of branch waterway 54 is connected to the third connecting waterway 53 between the ground source side outlet 22 and the user side inlet 41 through the first tee pipe 541. The outlet of branch waterway 54 is connected to the second connecting waterway 52 between the one-way valve 521 and the external user side water system through the second tee pipe 542. Specifically, the inlet of the first three-way pipe 541 is connected to the outlet 22 on the ground source side through a water pipe, the first outlet of the first three-way pipe 541 is connected to the inlet 41 on the user side through a water pipe, the second outlet of the first three-way pipe 541 is connected to the inlet of the branch water circuit 54 through a water pipe, the first inlet of the second three-way pipe 542 is connected to the outlet 42 on the user side through a water pipe, the second inlet of the second three-way pipe 542 is connected to the outlet of the branch water circuit 54 through a water pipe, and the outlet of the second three-way pipe 542 is connected to the external user-side water system through a water pipe.

[0033] A first flow regulating valve 531 is also installed on the water pipeline between the inlet of the branch water line 54 and the inlet 41 on the user side. The first flow regulating valve 531 is used to regulate the flow rate of the water medium flowing out from the outlet 22 on the ground source side into the heat exchanger 40 on the user side.

[0034] Compared with the prior art, the ground source heat pump system of this utility model with single water circulation can regulate the water medium flow rate entering the user-side heat exchanger 40 by adjusting the first flow regulating valve 531 when the compressor operating frequency remains unchanged, that is, the cooling capacity or heating capacity of the compressor remains unchanged. This regulates the temperature of the water medium flowing out of the user-side outlet 42, thereby controlling the temperature difference between the user-side inlet water and the user-side outlet water to remain within the set range, and avoiding problems such as the compressor exceeding the operating block diagram and abnormal unit operation.

[0035] Furthermore, in order to monitor the flow rate of the water medium flowing out of the ground source outlet 22 into the user-side heat exchanger 40 and to more accurately control the opening of the first flow regulating valve 531, a first flow meter 532 is also installed on the water pipe between the first flow regulating valve 531 and the user-side inlet 41 to detect the flow rate of the water medium flowing out of the ground source outlet 22 into the user-side heat exchanger 40.

[0036] A portion of the water flowing from the ground source outlet 22 directly enters the second connecting water pipe 52 via the branch water pipe 54. When the flow rate of the water entering the user-side heat exchanger 40 is only regulated by the first flow regulating valve 531, the flow rate of this portion of the water is uncontrolled, which can easily lead to an imbalance in the water flow rate of the ground source heat pump system. This results in unstable pressure and flow velocity of the water within the system, ultimately preventing the first flow regulating valve 531 from regulating the water flow rate as expected and failing to achieve the desired regulation effect. Therefore, this invention also provides a second flow regulating valve 533 in the branch water pipe 54. The second flow regulating valve 533 is used to regulate the flow rate of the water flowing directly from the ground source outlet 22 into the second connecting water pipe 52. The second flow regulating valve 533 can complement the first flow regulating valve 531. When the ground source side outlet water is diverted from the branch water line 54, by simultaneously adjusting the opening of the first flow regulating valve 531 and the second flow regulating valve 533, the water medium flowing out of the ground source side outlet 22 can be precisely distributed, achieving a reasonable ratio between entering the second connecting water line 52 through the user-side heat exchanger 40 and directly entering the second connecting water line 52 through the branch water line 54. Specifically, when the opening of the first flow regulating valve 531 increases, the opening of the second flow regulating valve 533 decreases; conversely, when the opening of the first flow regulating valve 531 decreases, the opening of the second flow regulating valve 533 increases, thereby avoiding the problem of unbalanced water medium flow distribution in the ground source heat pump system.

[0037] Furthermore, to monitor the flow rate of the water medium exiting from the ground source side outlet 22 and to more accurately control the opening of the second flow regulating valve 533, a second velocity meter 534 is also installed on the third connecting water pipe 53 between the ground source side outlet 22 and the inlet of the branch water pipe 54 to detect the flow velocity of the water medium exiting from the ground source side outlet 22. Preferably, the flow velocity of the third connecting water pipe 53 is set to 0-2m. 3 Within the range of / h.

[0038] In specific implementation, the first flow regulating valve 531 and the second flow regulating valve 533 are shut-off valves or one-way regulating valves, and the first flow meter 532 and the second flow meter 534 can be propeller flow meters, electromagnetic flow meters, ultrasonic flow meters, electromagnetic flow meters, etc. This utility model does not impose any restrictions.

[0039] Furthermore, to more precisely adjust the opening degrees of the first flow regulating valve 531 and the second flow regulating valve 533, the single-loop ground source heat pump system also includes a temperature detection module, which includes a first temperature sensor 61 and a second temperature sensor 62. The first temperature sensor 61 is located at the user-side inlet 41 and is used to detect the temperature of the incoming water on the user side. The second temperature sensor 62 is installed at the user-side water outlet 42 to detect the temperature of the water coming out from the user side.

[0040] To intelligently adjust the opening of the first flow regulating valve 531 and the second flow regulating valve 533 according to the inlet and outlet water temperatures on the user side, the single-circuit ground source heat pump system also includes a controller (not shown). The controller is electrically and / or communicatively connected to the first temperature sensor 61, the second temperature sensor 62, the first flow regulating valve 531, the first flow meter 532, the second flow regulating valve 533, and the second flow meter 534, respectively. The controller controls the opening of the first flow regulating valve 531 and the second flow regulating valve 533 according to the received temperature and flow rate signals, thereby keeping the temperature difference between the inlet water and the outlet water on the user side within a set range.

[0041] In one embodiment, if the temperature of the user-side inlet water detected by the first temperature sensor 61... The temperature of the water outlet on the user side is detected by the second temperature sensor 62. When the current temperature difference is higher than the preset temperature difference, the controller controls the opening of the first flow regulating valve 531 to decrease and controls the opening of the second flow regulating valve 533 to increase synchronously; when the current temperature difference is lower than the preset temperature difference, the controller controls the opening of the first flow regulating valve 531 to increase and controls the opening of the second flow regulating valve 533 to decrease synchronously.

[0042] In one embodiment, if the temperature of the user-side inlet water detected by the first temperature sensor 61... The temperature of the water outlet on the user side is detected by the second temperature sensor 62. When the current temperature difference deviates from the preset temperature difference, the controller calculates the target flow rate of the water medium flowing into the user-side heat exchanger 40 based on the preset temperature difference and the cooling or heating capacity of the ground source heat pump system. Then, based on the difference between the target flow rate and the current flow rate detected by the first flowmeter 532, the controller controls the opening of the first flow regulating valve 531 and the second flow regulating valve 533. When the current flow rate of the first flowmeter 532 is higher than the target flow rate, the controller controls the opening of the first flow regulating valve 531 to decrease and the opening of the second flow regulating valve 533 to increase synchronously, based on the difference between the current flow rate of the first flowmeter 532 and the target flow rate, until the current flow rate decreases and stabilizes at the target flow rate. When the current flow rate of the first flowmeter 532 is lower than the target flow rate, the controller controls the opening of the first flow regulating valve 531 to increase and the opening of the second flow regulating valve 533 to decrease synchronously, until the current flow rate increases and stabilizes at the target flow rate. The cooling and heating capacity of the ground source heat pump system is determined by the operating frequency of the compressor. Preferably, the sum of the flow rates of the water medium flowing through the first flow regulating valve 531 and the second flow regulating valve 533 is equal to the flow rate of the water medium flowing out from the outlet on the ground source side. That is, the sum of the opening degrees of the first flow regulating valve 531 and the second flow regulating valve 533 is determined by the current flow velocity of the second velocity meter 534. When the first flow regulating valve 531 and the second flow regulating valve 533 have the same specifications (i.e., the same flow-opening characteristic curves) and the current flow velocity detected by the second velocity meter 534 remains unchanged, the absolute value of the opening adjustment amount of the second flow regulating valve 533 is equal to the absolute value of the opening adjustment amount of the first flow regulating valve 531.

[0043] Taking the heating mode of a ground source heat pump system as an example, when the temperature of the user-side inlet water detected by the first temperature sensor 61... The temperature of the water outlet on the user side is detected by the second temperature sensor 62. Current temperature difference When the temperature difference is less than the preset temperature, the water medium entering the user-side heat exchanger 40 is excessive. At this time, the controller, based on the difference between the target flow rate and the current flow rate measured by the first flow meter 532, controls the opening of the first flow regulating valve 531 to decrease and the opening of the second flow regulating valve 533 to increase. When the temperature of the user-side inlet water detected by the first temperature sensor 61... The temperature of the water outlet on the user side is detected by the second temperature sensor 62. Current temperature difference When the temperature difference exceeds the preset temperature difference, the amount of water entering the user-side heat exchanger 40 is too small. In this case, the controller, based on the difference between the target flow rate and the current flow rate, controls the opening of the first flow regulating valve 531 to increase and the opening of the second flow regulating valve 533 to decrease. In this embodiment, the preset temperature difference is set to 7°C or 10°C.

[0044] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0045] (1) By installing a three-way pipe at the ground source side outlet of the single water circuit of the ground source heat pump system, the ground source side outlet is connected to the user side inlet and the user side outlet respectively. A flow regulating valve is installed in the water pipeline from the three-way pipe to the user side outlet so that the temperature difference between the user side outlet and the user side inlet can be adjusted and kept within the set range, thus avoiding the compressor exceeding the operating block diagram and the unit operating abnormally.

[0046] (2) By setting a flow meter and a second flow regulating valve that cooperate with the first flow regulating valve, the water medium flowing out of the ground source side outlet is accurately distributed, avoiding the problem of water medium flow distribution imbalance in the ground source heat pump system, ensuring the stability of the pressure and flow rate of the water medium in the system, and enabling the first flow regulating valve to regulate the water medium flow as expected.

[0047] (3) By setting up a temperature detection module and a controller, the opening of the first flow regulating valve and the second flow regulating valve can be intelligently adjusted according to the inlet and outlet water temperatures on the user side, thereby improving the system's operating efficiency and stability.

[0048] The terminology used in this embodiment of the invention is for the purpose of describing particular embodiments only and is not intended to limit the embodiments of the invention. The singular forms “a,” “the,” and “the” used in the embodiments of the invention and the claims are also intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that, unless otherwise stated, “a plurality” and “several” refer to two or more; “and / or” refers to and includes any or all possible combinations of one or more associated listed items; “first,” “second,” “third,” etc., are used only to distinguish and not to describe a particular order or sequence, nor should they be construed as indicating or implying relative importance. When the above description relates to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. In the description of this invention, those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0049] The embodiments described above are merely examples of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and this utility model also intends to include these modifications and variations.

Claims

1. A ground source heat pump system with a single water circulation loop, comprising a compressor, a ground source heat exchanger, a throttling valve, and a user-side heat exchanger connected sequentially via a refrigerant circulation pipeline, and a single water loop sequentially connecting an external ground source water intake system, the ground source heat exchanger, the user-side heat exchanger, and an external user-side water system, characterized in that, It also includes branch water channels, the inlet of which is connected to a single water channel between the ground source heat exchanger and the user-side heat exchanger, and the outlet of which is connected to a single water channel between the user-side heat exchanger and the external user-side water system. A first flow regulating valve is installed in the single water channel between the inlet of the branch water channel and the inlet of the user-side heat exchanger, and a circulating water pump is installed in the single water channel between the ground source heat exchanger and the external ground source water intake system.

2. The ground source heat pump system with single-circuit water circulation according to claim 1, characterized in that, A first flow meter is installed in the single water path between the first flow regulating valve and the inlet of the user-side heat exchanger.

3. The ground source heat pump system with single-circuit water circulation according to claim 2, characterized in that, A second flow regulating valve is installed in the branch waterway.

4. The ground source heat pump system with single-circuit water circulation according to claim 3, characterized in that, The first flow regulating valve and the second flow regulating valve are shut-off valves or one-way regulating valves.

5. The ground source heat pump system with single-circuit water circulation according to claim 3, characterized in that, A second flow meter is installed in the single water passage between the outlet of the ground source heat exchanger and the inlet of the branch water passage.

6. The ground source heat pump system with single-circuit water circulation according to claim 5, characterized in that, The first flow meter and the second flow meter are propeller flow meters, electromagnetic flow meters, ultrasonic flow meters, or electromagnetic flow meters.

7. The ground source heat pump system with single-circuit water circulation according to claim 5, characterized in that, A first temperature sensor is installed at the inlet of the user-side heat exchanger to detect the temperature of the incoming water on the user side. A second temperature sensor is installed at the outlet of the user-side heat exchanger to detect the temperature of the water outlet on the user side.

8. The ground source heat pump system with single-loop water circulation according to claim 7, characterized in that, It also includes a controller, which is electrically and / or communicatively connected to a first temperature sensor, a second temperature sensor, a first flow meter, a second flow meter, a first flow regulating valve, and a second flow regulating valve.

9. The ground source heat pump system with single-circuit water circulation according to claim 8, characterized in that, The controller according to and The temperature difference and the current flow rates of the first and second flow meters are used to control the opening of the first flow regulating valve and / or the second flow regulating valve.

10. The ground source heat pump system with single-loop water circulation according to claim 1, characterized in that, A one-way valve is installed in the single water passage between the outlet of the user-side heat exchanger and the outlet of the branch water passage.

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